package chepter05.example10;

import java.io.IOException;
import java.util.Random;

public class Example10 {
    public static void main(String[] args) throws IOException {
        // System类
        long time = System.currentTimeMillis();
        System.out.println("time = " + time);
        //Runtime类
        Runtime rt = Runtime.getRuntime();
        //   rt.exec("notepad.exe");
        //Math类
        System.out.println(Math.random());
        System.out.println(Math.PI);
        //Random类
        Random random = new Random();
        for (int i = 0; i < 10; i++) {
            //  random.nextInt(56);
            System.out.println(random.nextInt(56));
        }
    }
}
